CN112796308A

CN112796308A - Long spiral drilling machine and cast-in-place pile construction method

Info

Publication number: CN112796308A
Application number: CN202110167365.3A
Authority: CN
Inventors: 刘立丰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-05-14

Abstract

The application discloses long auger drilling machine and bored concrete pile construction method, long auger drilling machine contains auger stem, is provided with the centre bore in the auger stem, the centre bore is connected with the grouting pump. The construction method of the cast-in-place pile comprises the following steps: drilling by a spiral drill rod drilling machine; and when the spiral drill rod is lifted, grouting into the drill hole through the central hole. The method and the device can reduce the transportation cost, improve the economic performance, improve the construction speed, improve the efficiency of forming the hole by the slurry retaining wall, save energy and protect environment.

Description

Long spiral drilling machine and cast-in-place pile construction method

Technical Field

The application relates to the technical field of building construction, in particular to a long spiral drilling machine and a cast-in-place pile construction method.

Background

A method for forming holes by using a rotary drilling rig mud retaining wall is a conventional process for realizing the hole forming of the mud retaining wall by continuously injecting cement slurry while continuously rotating and digging a soil layer from top to bottom on the premise of utilizing the mud retaining wall on the stratum which cannot realize dry hole forming; the method comprises the following specific steps: positioning, perforating a lower protective cylinder, drilling and injecting slurry, perforating, lowering a reinforcement cage and pouring concrete.

By using the method for forming the hole by using the mud protective wall of the rotary drilling rig, the amount of the pile core mud generated in a construction site is large, the outward transportation cost and the absorption cost are high, the influence on environmental protection in mud transportation is large, the road is easily polluted, and the cleaning is extremely difficult; the traditional rotary drilling rig is slow in construction speed and needs to excavate from top to bottom one bucket by one bucket, so that the construction speed is limited and is slow; the traditional process has higher cost; because the diesel engine is mostly adopted as a power source, the diesel consumption ratio is higher in the construction process, and the construction cost is high; moreover, diesel oil burns to produce a large amount of harmful substances, which pollute air and are not beneficial to environmental protection.

The working method of the long spiral drilling machine in the prior art mainly comprises the steps of directly drilling a hole to the bottom of the hole, continuously pouring concrete, simultaneously lifting the drill until the drilling is finished, then hoisting the steel bar cage by using a crane, and vibrating the cage by using a vibration hammer until the bottom of the poured concrete hole is finished.

The existing rotary drilling rig can not be applied to a long spiral drilling rig because of hole forming of a mud protection wall. Because the long spiral drilling machine drills by depending on the continuous drilling of the long spiral drill rod from top to bottom, soil cannot be taken out of the hole in the drilling process, and the soil is taken out only when the drill is lifted. Namely, the method for fetching earth by the long spiral drilling rig is different from the earth fetching mode of the rotary drilling rig, so that holes cannot be formed in a mode of protecting walls by mud.

Disclosure of Invention

The application provides a long spiral drilling machine and a cast-in-place pile construction method, which aim to solve the problems in the prior art, realize the purpose of forming holes by adopting back pressure mud retaining walls on the basis of realizing efficient drilling; the problem that the long auger stem is applied to the reverse-inserted cage cast-in-place pile can be solved, the hole forming can be realized firstly, the cage is placed firstly and then the cast-in-place pile is placed, the hole forming efficiency is improved, the construction process is very environment-friendly, and the construction cost is reduced.

One aspect of the present application provides a cast-in-place pile construction method, including the steps of,

drilling through a spiral drill rod drilling machine with a central hole;

and when the spiral drill rod is lifted, grouting into the drill hole through the central hole.

Furthermore, the spiral drill rod is formed by combining a plurality of sections of drill rods, and a sealing ring is padded at the joint of the adjacent drill rods.

Furthermore, the spiral drill rod is formed by combining a plurality of sections of drill rods, and a water bag is arranged in a center hole of the spiral drill rod.

Furthermore, a protective cylinder is arranged below the punching position.

Further, during grouting, pressure control is performed on the slurry, so that the slurry can be pressed into the drill hole by the pressure of the slurry.

Furthermore, when grouting is carried out, flow control is carried out on the slurry, so that the drilled holes can be filled with the slurry.

The invention also provides a long spiral drilling machine which is used for realizing the cast-in-place pile construction method in one aspect of the invention.

Furthermore, a water bag is arranged in the central hole. Preferably, the water bag is connected with a grouting pipe of the grouting pump through a steering movable joint. The steering movable joint may be a universal valve.

The construction method of the long spiral drilling machine and the cast-in-place pile can achieve the following beneficial effects:

the long spiral drilling machine and the cast-in-place pile construction method can reduce the transportation cost, improve the economic performance, improve the construction speed, improve the efficiency of slurry breast wall hole forming, save energy and protect environment.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a flowchart of a cast-in-place pile construction method of the present application;

FIG. 2 is a schematic structural view of the long auger drilling machine of the present application;

FIG. 3 is a schematic diagram of a splicing structure of a grouting pipe of the long spiral drilling machine of the application;

fig. 4 is a schematic view of a positioning step of the cast-in-place pile construction method of the present application;

fig. 5 is a schematic view of a drilling step of the cast-in-place pile construction method of the present application, and the direction indicated by the arrow in fig. 5 is a direction in which the auger stem drills downward;

FIG. 6 is a schematic grouting diagram of the cast-in-place pile construction method of the present application, and the direction indicated by the arrow in FIG. 6 is the direction in which the auger stem is lifted upwards while grouting;

FIG. 7 is a schematic diagram of a hole forming step of the cast-in-place pile construction method of the present application;

in the figure, 1 is a spiral drill rod, 2 is a central hole, 3 is a steering movable joint, 4 is a grouting pipe, 401 is a thread, 5 is a hole, 6 is slurry, 7 is a casing, and 8 is a grouting pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The cast-in-place pile construction method of the embodiment adopts a method for forming holes by using a mud retaining wall of a long spiral drilling rig, and is a construction process which is operated reversely on the basis of the method for forming holes by using the mud retaining wall of the rotary drilling rig. After an auger stem of a long spiral drilling machine drills to the bottom of a pile from top to bottom, the drill is lifted, and soil is continuously taken out during the drill lifting; and (3) pressing slurry into the hole while lifting the drill, wherein the slurry can be slurry.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example 1

Referring to fig. 1, a method for constructing a cast-in-place pile includes the steps of,

step S01: positioning and determining a punching position;

preferably, the casing 7 is lowered at said punching position;

step S02: drilling by a drilling machine of the spiral drill rod 1 to the bottom;

here, the hole bottom is a set depth;

step S03: grouting into the hole 5;

the slurry 6 injected into the hole may be slurry, cement slurry, or slurry with admixture, such as dry powder admixture with crystallization, which makes the concrete structure waterproof, anticorrosive and strengthen.

Step S04: the spiral drill rod 1 is lifted out while grouting;

continuously taking out soil during lifting the drill;

step S05: after the drilling and grouting are completed, the hole forming with the pile casing 7 and the mud retaining wall is realized.

Step S06: and after the hole 5 is formed, repeating the drilling and grouting steps, or putting a reinforcement cage into the hole 5.

Therefore, all the brought out pile core soil is not required to be soaked by slurry, so that the drilled out soil is relatively dry, the transportation cost of the outward transported pile core soil is reduced, and the economy is improved. In addition, the construction speed and the lifting and rotating speed of the long spiral drilling machine are far higher than those of the traditional rotary drilling machine, so that the cast-in-place pile construction method of the embodiment is more efficient in hole forming of the slurry retaining wall of the long spiral drilling machine. In addition, the electric power can be adopted instead of diesel oil, so that the construction cost is lower, the emission pollution is reduced, and the environment is more protected.

Example 2

In the cast-in-place pile construction method according to embodiment 1, the auger stem 1 may be formed by combining a plurality of sections of drill stems, and a joint between adjacent sections of drill stems may be sealed.

During the grouting, the pressure of the slurry 6 is controlled so that the pressure of the slurry 6 can overcome the height of the drill rod and press the slurry 6 into the borehole 5. It is also possible to perform grouting by flow-controlling the slurry 6 and injecting a set amount into the hole, e.g. so that the slurry 6 fills the borehole 5.

Wherein the slurry 6 may be pressure controlled by hydraulics or pneumatics to facilitate the slurry 6 being pumped out and filling the borehole 5. The slurry 6 may also be flow controlled by a flow meter to enable the slurry 6 to fill the borehole 5.

According to the construction method of the cast-in-place pile, on the basis of realizing efficient drilling through long auger drilling, the purpose of forming holes in the retaining wall is realized by adopting back pressure mud; and further, when the long spiral drilling machine is applied to the reverse-insertion cage cast-in-place pile, the hole forming efficiency is improved, the environmental protection performance of the construction process is improved, and the construction cost is reduced.

In the cast-in-place pile construction method according to embodiment 1 and embodiment 2, the high-pressure grouting pipe may be a high-pressure water bag connected between the grouting pump 8 and the upper portion of the auger stem 1. The slurry 6 may be used as a slurry, and the grouting pump 8 may be provided in a slurry tank. Alternatively, a cement slurry may be used for the slurry 6. The number of the grouting pumps can be set to be at least two in different models, so that the grouting pumps in different models can pass through respective pressure control range and flow control range, and the grouting pumps are suitable for the requirement of grouting mud with different pressure and flow.

The cast-in-place pile construction method of the embodiment 1 and the embodiment 2 can realize the slurry wall protection and hole forming 5, firstly, a large amount of slurry generated in the process can be reduced, further, the cost of the transportation and consumption process is reduced, and the cast-in-place pile construction method has extremely high environmental protection value; secondly, spiral drilling is adopted, so that the drilling speed is far higher than that of a conventional rotary drilling rig; and thirdly, the electric power can be used for driving, and the power cost is far lower than that of a rotary drilling rig which adopts diesel oil as the power of an engine for driving.

Example 3

Referring to fig. 2, the long auger drill is used for implementing the cast-in-place pile construction method, and comprises an auger stem 1, wherein the center hole 2 is arranged in the auger stem 1, and the center hole 2 is connected with a grouting pump 8 through a grouting pipe 4. A discharge hole is formed in the drill bit at the end of the spiral drill rod 1 and communicated with the central hole 2.

The auger stem 1 may be a round rod with helical blades on the outer wall, and the central hole 2 may be a cylindrical cavity, the central axis of which coincides with the central axis of the auger stem 1.

The grout tube 4 may comprise a composite splice structure of at least two sections of grout tube 4. Two adjacent grouting pipes 4 are connected through threads 401, as shown in fig. 3.

In the apparatus of the present application, the grouting pump 8 is used to provide a slurry of constant pressure, the pressure to be met depending on the depth of the pile in which the hole 5 is to be formed. The length of each section of grouting pipe 4 can be 10-20 m. The grouting pump 8 may be a grouting pump or a sewage pump, such as a large sewage pump.

The grout outlet of the grouting pump 8 is communicated with the grouting pipe 4, the grouting pipe 4 is communicated to the uppermost part of the spiral drill rod 1 and then connected with the central hole 2 in the spiral drill rod 1 through the universal valve, and further controlled through a power switch connected with the grouting pump 8 from the outside. The grout tube 4 may be a high or ultra high pressure grout tube to achieve and withstand the pressure to lift and pour the slurry 6 into the borehole 5. The high-pressure grouting pipe may employ a high-pressure water bag connected between the grouting pump 8 and the upper portion of the auger stem 1.

The long auger drilling system comprises an auger stem with a central hole, a grouting pipe, one or more grouting pumps and a mud pit. The grouting pump 8 may be provided in the mud pit. The number of grouting pumps in the mud pit may be at least two of different models. The grouting pumps of different models, their respective pressure control range and flow control range, can be applicable to the needs of filling to the mud of different pressure and flow.

Example 4

On the basis of the long auger drilling machine in embodiment 3, the auger stem 1 is formed by combining a plurality of sections of auger stems, a sealing ring is padded at the joint of the adjacent auger stems, and/or the auger stem 1 is formed by combining a plurality of sections of auger stems, a water bag is arranged in the central hole 2 of the auger stem 1, and slurry flows into the water bag in the central hole 2 and further flows into the bottom of a pit. Therefore, slurry 6 in the spiral drill rod 1 can be prevented from leaking out of the drill rod joint through the sealing ring and/or the water bag, water or silt entering the outside of the drill rod can be prevented, the sealing performance of the joint is guaranteed, and grouting is facilitated.

The water bag can be connected with the grouting pipe of the grouting pump 8 through the steering movable joint 3. The steering movable joint 3 may be a universal valve. The universal valve may also employ a dedicated fitting within the power head. The universal valve ensures that the auger stem 1 and the grouting pipe 4 cannot rotate along with the rotation of mud in the auger stem 1.

The bottom of the water bag is communicated and connected with a grout outlet on the drill bit of the spiral drill rod 1.

When using a grouting pump, the pressure control of the slurry 6 is such that the pressure of the slurry 6 can press the slurry 6 into the borehole 5 against the drill rod height. When the drill is lifted, the height of the top of the drill reaches the depth value of the drill hole 5, and when the spiral drill rod is composed of a plurality of sections of drill rods, the required pressure is larger.

When the long spiral drilling machine is used for realizing the cast-in-place pile construction method, the method can comprise the following steps,

as shown in fig. 4, positioning is carried out, a punching position is determined, and a protective sleeve 7 is arranged below the punching position;

the casing 7 may be a cylinder. The height of the casing 7 may be 3m, and the wall thickness of the casing 7 may be 1 cm. The diameter of the casing 7 may be 20cm larger than the diameter of the post.

Drilling is carried out by the auger stem 1 rig, as shown in fig. 5, and to the bottom;

when the set depth value is larger, the spiral drill rod 1 can be formed by combining a plurality of sections of drill rods;

as shown in fig. 6, a grouting pump 8 is started, and grouting is performed into the hole 5 through a grouting pipe; the spiral drill rod 1 is lifted out while grouting; when the water bag is arranged in the drill rod, the slurry flows into the bottom of the hole through the grouting pipe (high-pressure water bag), the water bag in the drill rod and the discharge hole at the front part of the drill bit.

After drilling and grouting are completed, a hole is formed with the casing 7 and the mud dado, as shown in fig. 7.

And after the hole 5 is formed, repeating the drilling and grouting steps, or putting a reinforcement cage into the hole 5.

When the drilling and grouting steps are repeated, the problem that when the auger stem 1 is lifted upwards for soil lifting after repeated drilling is avoided, slurry 6 is mixed with the lifted soil, and the construction effect is influenced is solved; can adopt two-way grouting pump with grouting pump 8, like this, when needs repeated drilling step, need drill down in the original hole once more promptly, can reverse grouting pump 8 of opening earlier for grouting pump 8 is earlier with the slurry 6 resorption in drilling 5, then drills and mentions auger stem 1 in order to carry soil, avoids slurry 6 and is carried the soil and mixes, guarantees the construction effect.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A construction method of a cast-in-place pile is characterized by comprising the following steps,

drilling through a spiral drill rod drilling machine with a central hole;

2. A cast-in-place pile construction method as defined in claim 1,

the spiral drill rod is formed by combining a plurality of sections of drill rods, and a sealing ring is padded at the joint of the adjacent drill rods.

3. A cast-in-place pile construction method as defined in claim 1,

the spiral drill rod is formed by combining a plurality of sections of drill rods, and a water bag is arranged in a center hole of the spiral drill rod.

4. A cast-in-place pile construction method as defined in claim 1,

and a protective cylinder is arranged below the punching position.

5. A cast-in-place pile construction method as defined in claim 1,

and when grouting is carried out, pressure control is carried out on the slurry, so that the slurry can be pressed into the drill hole by the pressure of the slurry.

6. A cast-in-place pile construction method as defined in claim 1,

and when grouting is carried out, flow control is carried out on the slurry, so that the drilling holes can be filled with the slurry.

7. A long spiral drilling machine for realizing the cast-in-place pile construction method of any one of claims 1 to 6, comprising a spiral drill rod, wherein the center hole is arranged in the spiral drill rod and is connected with a grouting pump through a grouting pipe.

8. The long auger drill of claim 7, wherein a water bag is disposed within the central bore.

9. The long auger drilling machine of claim 8, wherein said water bag is connected to the grout pipe of said grouting pump by a swivel joint.

10. The long auger drilling of claim 9, wherein said steering knuckle is a universal valve.